$-e+8e$
$-38d-57\ge-19d+76$
$5\:a^2\:-\:2a\:-\:\:5\:,\:si\:\:a=\:\:\:-2$
$+\frac{x+5}{x^2+x}$
$-81+9a^{10}$
$\left(5x+2x^2\right)^2$
$-\left(-30\right):6+5+24:\left(-3\right)$
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